SABELLIDES AND SERPULIDES 289 



collar setae have angular tapered blades. As the article on Spirorbis, 

 by Caullery and Mesnil, could not be consulted, these two species could 

 not be identified. The first may be S. beneti Marion 1875. 



In the posterior segments of one animal of Spirorbis mutabilis were 

 clusters of spermatogonia and isolated spermatozoa, also good-sized 

 eggs with large nucleii, this being the only instance noted among the 

 many animals studied. (See pp. 252 and 255.) 



Genus Rhodopsis nov. (See pp. 179 and 223.) 



Tube small, calcareous, hair-like, more or less sigmoid, usually 

 attached its entire length to the under surface of the common hat-coral 

 {Agaricia fragilis} from Bermuda. 



Animal minute, deep yellow, with the operculum protected by a 

 disproportionately large, chitinous disk covered with numerous un- 

 equal irregular light horn-colored processes or spines arranged in the 

 form of a rosette hence the name. 



Branchiae not determined, appearing as a mass back of the opercu- 

 lum, in the six specimens examined. 



Eyes two, conspicuous red, showing beneath the collar. 



Thorax short, the segments defined on each side by the 6, in one 

 instance 5, small fascicles of setae at the end of the 6 series of uncini, 

 there being no separate fascicle on the collar. Body cavity elongated, 

 showing dark brown intestinal tract. Posterior portion usually muti- 

 lated ; when perfect, ornamented along the dorsal ( ?) area by long 

 irregular ribbon-like appendages somewhat resembling the spines on 

 the operculum ; the elongated segments (about 5) defined on the oppo- 

 site (ventral ?) area by transverse lines, a series of uncini on the mid- 

 dle of each ; but no setae were seen. 



Thoracic setae bent at the base of the broad abruptly tapered blade. 

 Uncial plates (seen in profile) similar to those of Filograna, with 

 about ten rather blunt appressed teeth, the lowest larger than the 

 others ; seen in front the broad tapered face has several alternating 

 rows of minute pointed teeth. On the abdomen the uncini were seen 

 only in a front view ; the face is broad, of uniform width, and no ser- 

 rations could be made out even with the T ^ oil immersion objective. 



Rhodopsis pusillus sp. nov. (See pp. 179 and 223.) 



Type locality. Bermuda. 



Numerous small round tubes of uniform diameter, with both ends 

 open, resembling fine wavy white hairs are found scattered over the 

 under surface of the common hat-coral {Agaricia fragilis) . 



